Restore Your Vehicle’s Performance and Reliability
Is your 2006 GMC Envoy, Trailblazer, or other compatible GM vehicle suffering from frustrating, hard-to-diagnose issues? A faulty Powertrain Control Module (PCM) is often the culprit behind problems like poor fuel economy, erratic shifting, a persistent Check Engine Light, or even a no-start condition. As the central computer for your engine and transmission, a failing PCM can disrupt your vehicle’s entire operation. I’ve spent years in the service bay tracing these exact symptoms back to a faulty module. This isn’t just a replacement part; it’s the definitive solution to get your truck or SUV running like new again.
This isn’t a generic, off-the-shelf computer. We provide a professionally programmed 2006 Envoy Powertrain Control Module that arrives ready for installation. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) during checkout, and our technicians will flash the module with the latest, most stable GM factory software specific to your vehicle. This critical step ensures seamless communication with all other modules, proper engine and transmission function, and eliminates the need for an expensive trip to the dealership for programming.
A Technician’s Notebook: The Intermittent Stall
I remember a 2006 Trailblazer with the 4.2L that came into the shop with a complaint that stumped two other mechanics. The owner said it would randomly stall at red lights, but never stored a consistent trouble code. We checked fuel pressure, sensors, and wiring harnesses—everything looked fine. On a hunch, I monitored the PCM data stream during a long test drive. I noticed the processor would occasionally reset itself for a split second, just long enough to kill the engine. We swapped in a correctly programmed PCM, and the problem vanished. It’s a classic example of how a failing 2006 Envoy Powertrain Control Module can cause ghost-like issues that are nearly impossible to trace without seeing it firsthand.
Common Signs of a Failing PCM
If you’re experiencing any of the following, your PCM might be the root cause. A failing module can often trigger diagnostic trouble codes (DTCs) such as P0601 (Internal Control Module Memory Check Sum Error), P0606 (PCM Processor Fault), or various communication errors.
- ✔ Check Engine Light is on with no clear cause
- ✔ Vehicle fails to start or has a hard starting condition
- ✔ Unexplained drop in fuel efficiency
- ✔ Engine stalling, sputtering, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication issues with your scan tool
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle with basic tools. Our pre-programming service makes it even simpler. Follow these general steps to get back on the road:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes to allow all modules to power down completely.
- Locate the Module: On most 4.2L models (Envoy, Trailblazer, Rainier), the PCM is located on the driver’s side of the engine compartment. On other models (Colorado, Canyon, H3), it’s typically mounted on the passenger’s side firewall.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old PCM. Inspect the connectors for any corrosion or damage.
- Remove the Old PCM: Unbolt the module from its mounting bracket. It’s usually held in place by a few small bolts.
- Install the New PCM: Mount your new, pre-programmed module in place and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harness connectors firmly into the new PCM until they click into place. Reconnect the negative battery terminal.
- Final Steps: In some cases, a security relearn procedure may be necessary. This can typically be done by turning the key to the ‘ON’ position for 10-15 minutes, then off, and then starting the vehicle. Consult your vehicle’s service manual for the exact procedure if required.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles and supersedes multiple part numbers, ensuring you get the right component. Please confirm your model and options below. This part fits the following part numbers: 12569773, 12588650, 12589311, 12589585, 12591647, 12591648, 12593531, 12593532, 12594430, 12594431, 12596783, 12596784, 12597521, 12597776, 12597777, 12600818, 12604438, 12604439, 12606369, 12606373, 12606374, 12606398, 12606399, 19209820, 19209821.
- Buick Rainier: 2006 (4.2L, LH Engine)
- Chevrolet Colorado: 2004-2006 (RH Firewall)
- Chevrolet Trailblazer & Trailblazer EXT: 2006 (4.2L, LH Engine)
- GMC Canyon: 2004-2006 (RH Firewall)
- GMC Envoy & Envoy XL: 2006 (4.2L, LH Engine)
- Hummer H3: 2006 (RH Firewall)
- Isuzu Ascender: 2006 (4.2L, LH Engine)
- Isuzu i-280: 2006 (RH Firewall)
- Isuzu i-350: 2006 (RH Firewall)
- Saab 9-7X: 2006 (6 Cylinder, LH Engine)
Choosing this quality 2006 Envoy Powertrain Control Module is the most effective way to solve complex electronic issues and restore the dependable performance you expect from your vehicle.
Why do you need my VIN?
Why do you need my VIN?
Your VIN is essential for us to program the PCM with the correct factory software for your vehicle’s specific configuration, including engine, transmission, and emissions options. This ensures a perfect match and plug-and-play installation.
Will I need to do anything after installing this PCM?
Our programming service handles the majority of the work. In some cases, a simple ‘security relearn’ or ‘CASE relearn’ procedure may be needed, which can often be done without special tools. We recommend checking your vehicle’s service manual for specific instructions.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part. Each module is verified to be fully functional before being programmed with fresh, updated GM software for your vehicle, offering OEM performance at a great value.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the PCM (like code P0601), this part is the correct fix. However, if the light is on due to a bad sensor or other mechanical issue, you will still need to diagnose and repair that separate problem.